Steve Loughran 5be450393c
MAPREDUCE-7315. LocatedFileStatusFetcher to collect/publish IOStatistics. (#2579)
Part of the HADOOP-16830 IOStatistics API feature.

If the source FileSystem's listing RemoteIterators
implement IOStatisticsSource, these are collected and served through
the IOStatisticsSource API. If they are not: getIOStatistics() returns
null.

Only the listing statistics are collected; FileSystem.globStatus() doesn't
provide any, so IO use there is not included in the aggregate results.

Contributed by Steve Loughran.

Change-Id: Iff1485297c2c7e181b54eaf1d2c4f80faeee7cfa
2021-01-14 13:20:38 +00:00
2020-04-30 13:33:42 +09:00

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